From the sound of it (kids not wanting to learn a new language, wife already afraid of "hostility from locals", looking only to live with fellow Americans with no desire to mix with locals), your entire family is moving because of your job. And from the sound of them offering you 20k for accommodations, they aren't paying you through the nose. If I were you I would stay put, I'm pretty sure the rest of your family will hate it. Sorry for the bluntness